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KVM: ARM: vgic: abstract MISR decoding 

Instead of directly dealing with the GICH_MISR bits, move the code to
its own function and use a couple of public flags to represent the
actual state.

Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Marc Zyngier 2013-06-04 11:02:10 +01:00 committed by Christoffer Dall
parent 8d6a0313c1
commit 495dd859f3
2 changed files with 27 additions and 3 deletions
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4
include/kvm/arm_vgic.h
View File

@ -87,6 +87,7 @@ struct vgic_ops {
void (*sync_lr_elrsr)(struct kvm_vcpu *, int, struct vgic_lr);
u64 (*get_elrsr)(const struct kvm_vcpu *vcpu);
u64 (*get_eisr)(const struct kvm_vcpu *vcpu);
u32 (*get_interrupt_status)(const struct kvm_vcpu *vcpu);
};
struct vgic_dist {
@ -165,6 +166,9 @@ struct vgic_cpu {
#define LR_EMPTY 0xff
#define INT_STATUS_EOI (1 << 0)
#define INT_STATUS_UNDERFLOW (1 << 1)
struct kvm;
struct kvm_vcpu;
struct kvm_run;

26
virt/kvm/arm/vgic.c
View File

@ -1050,12 +1050,26 @@ static u64 vgic_v2_get_eisr(const struct kvm_vcpu *vcpu)
return val;
}
static u32 vgic_v2_get_interrupt_status(const struct kvm_vcpu *vcpu)
{
u32 misr = vcpu->arch.vgic_cpu.vgic_v2.vgic_misr;
u32 ret = 0;
if (misr & GICH_MISR_EOI)
ret |= INT_STATUS_EOI;
if (misr & GICH_MISR_U)
ret |= INT_STATUS_UNDERFLOW;
return ret;
}
static const struct vgic_ops vgic_ops = {
.get_lr = vgic_v2_get_lr,
.set_lr = vgic_v2_set_lr,
.sync_lr_elrsr = vgic_v2_sync_lr_elrsr,
.get_elrsr = vgic_v2_get_elrsr,
.get_eisr = vgic_v2_get_eisr,
.get_interrupt_status = vgic_v2_get_interrupt_status,
};
static struct vgic_lr vgic_get_lr(const struct kvm_vcpu *vcpu, int lr)
@ -1085,6 +1099,11 @@ static inline u64 vgic_get_eisr(struct kvm_vcpu *vcpu)
return vgic_ops.get_eisr(vcpu);
}
static inline u32 vgic_get_interrupt_status(struct kvm_vcpu *vcpu)
{
return vgic_ops.get_interrupt_status(vcpu);
}
static void vgic_retire_lr(int lr_nr, int irq, struct kvm_vcpu *vcpu)
{
struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
@ -1282,11 +1301,12 @@ epilog:
static bool vgic_process_maintenance(struct kvm_vcpu *vcpu)
{
struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
u32 status = vgic_get_interrupt_status(vcpu);
bool level_pending = false;
kvm_debug("MISR = %08x\n", vgic_cpu->vgic_v2.vgic_misr);
kvm_debug("STATUS = %08x\n", status);
if (vgic_cpu->vgic_v2.vgic_misr & GICH_MISR_EOI) {
if (status & INT_STATUS_EOI) {
/*
* Some level interrupts have been EOIed. Clear their
* active bit.
@ -1319,7 +1339,7 @@ static bool vgic_process_maintenance(struct kvm_vcpu *vcpu)
}
}
if (vgic_cpu->vgic_v2.vgic_misr & GICH_MISR_U)
if (status & INT_STATUS_UNDERFLOW)
vgic_cpu->vgic_v2.vgic_hcr &= ~GICH_HCR_UIE;
return level_pending;